The common oyster is a member of the mollusk family. It can be found in both marine environments as well as brackish waters. Brackish water, for those of you unfamiliar with the term is water that is partly fresh water and partly salt water. Brackish water is most commonly found at the mouths of rivers entering into the ocean.
Oysters have been harvested and eaten since prehistoric times. If a population lived close enough to the coast line then they probably ate oysters at some point in their local history. Since the water that the present day oyster lives in has become polluted there are concerns about the health and safety of those that eat the oyster. There is a very informative website that has educational information about the oyster industry. It is at Gulf oysters. For those of you needing oyster recipes they have them there too. I was particularly interested in the “Oyster Cornbread Dressing”